diff --git a/docs/apis/load_model.md b/docs/apis/load_model.md
index 9a32ca613cb61c72aea0d1822c7fba6f26846472..0e460ee583c8bb4030d202372dae40882b7b34dd 100644
--- a/docs/apis/load_model.md
+++ b/docs/apis/load_model.md
@@ -34,7 +34,7 @@ pred_result = model.predict('./xiaoduxiong_ins_det/JPEGImages/WechatIMG114.jpeg'
 
 # 在验证集上进行评估
 eval_reader = pdx.cv.datasets.CocoDetection(data_dir=data_dir,
-                                            ann_file=ann_file
+                                            ann_file=ann_file,
                                             transforms=model.eval_transforms)
 eval_result = model.evaluate(eval_reader, batch_size=1)
 ```